Die forming and trimming apparatus



H. J. SMITH AND E. P. EVERETT. DIE FORMING AND TRIMMING APPARATUS.

APPLICATION FILED APR. I5, 19]!)- Patented Apr. 20, 1920.

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FLUSHING, NEW YORK; SAID SMITH ASSIGNOR OF HIS ENTIRE RIGHT TO EVERETT FIBRE PRODUCTS CORPORATION, A CORPORATION 01 DELAWARE.

DIE romaine AND rnmiame APPARATUS.

Specification of Letters latent. Patented Apr. 20, 1920.

Application filed April 15, 1919. Serial No. 290,291.

To all whom it may concern:

Be it known that we, HERBERT J. SMITH, a subject of the Dominion of Canada, residing in the town of Kearney, county of Hudson, and State of New Jersey, and ERN ST I. EVERETT, a citizen of the United States of America, residing in the town of Flushing, county of Queens, and State of New 'York, have invented new and useful Improvements in a Die Forming and Trimming Apparatus, of which the follo ing is a specification.

The invention comprises a die 1 forming and trimmingapparatirs, and the object is particularly to provide improved means for making laminated barrel elements of the kind and under the process disclosed'in United States 'Letters Patent No. 1,183,861 of May 23, 1916, issued to your joint petiparatus combines with the die members a set of spring-pressed trimming-knives laterally movable in a suitable holder, the knives and die being in bevel relation, together with means, as stout springs. for sustaining the die abo've the-knife-holder (or conversely) until the article has been formed or, sufficientl compressed between the dies, whereupon the springs yield, permitting the sustained part to descend relatively to the other and thereby causing the knives to shear off the edges of the stave at the requisite bevel and curvature. These and other features of the invention will become apparent as the specification proceeds, it-being understood that! we do not limit ourselves to the precise form and applicatiomwhich are susceptible of modification.

In the accompanying drawings:

' Figure 1 is a. view partly n side elevation and partly in central vertical longi-.

tudinal section; and

Fig. 2 is an end elevation.

A stave blank, made in accordance with our prior patent of forming a blank of a plurality oflayers'with adhesive between, is placed between the elongated forming die members 1 and 2. the upper member 1 in this instance having a longitudinally and transversely concaved workingv face and the lower member 2 having a correspondingly convexed face provided toward the ends with transverse ribs 3 to form the crozes. The upper forming member has apertured The present ap margin flanges 4'forattachment to the upper part of a press, represented diagrammatically at 5. The lower forming member 2 is mounted in a frame or bed member 6, which is adapted to rest upon the bed of the press and constitutes a holder for trimming knives 7 and 8, hereinafter described. It will be understood that the-relations might be reversed, the arrangement shown, however, being more advantageous.

The convex forming member 2 is con nected to the knife-holder 6 with freedom for :vertical guided movement by means of posts 9 and 10 which rise from the base of the knife-holder to enter correspondingly formed sockets 11 and 12 in the die member, the sockets 9 being hollow and provided with reduced apertures in their tops to receive and retain the heads of pins 13 projecting downward from the die member. Stiff sustaining springs 14- are interposedv between the convex die member 2 and the knifeholder or, which amounts to the same thing, between the die member and the bed of the press upon which the knife-holder rests. The function of these springs is to hold the die part and knife part in vertically separated relation against pressure while. the

stave A is being formed between the die members, after which the springs are over: come so that the die descends relatively to the knives. 'The heads of the pins 13 cooperating with the apertures in the posts 9 limit the separation of the die and knifeholder under the action of the springs.

The convex die member 2 is tapered or beveled downwardly, that is to say reversely to the convexity of its working face, the long of the knives, however, we propose to construct around the metal die member 1 a casing of wood or other soft material, and die member 1 itself may be Constructed of .wood

or other. soft material. The end knives 8 extend transversely across and beyond the ends of the die member 2, and are of substantially triangular cross section, with bases finished to slide upon finished surfaces 18 of the knife-holder 6 and their inner faces beveled substantially in conformity with the bevel of the end faces of the die member.

These faces of the end knives and their top cutting edges 19 are also transversely incurved to correspond with the opposed body faces. The knives thus positioned are pressed toward the die member by springs 20 interposed between the knives and abutment portions of the knife-frame, where they are retained by pins 21. Additional horizontal guide pins 22 screwed into the knife-holder frame extend at their inner ends into guide sockets 23in the backs of the knives. The cutting edges of these knives may lie in horizontal planes, as shown.

The side trimming-knives 7 are similarly mounted and guided, 20 being their springs and. 21 22 the corresponding pins, and

their inner faces are straight-beveled to toact with the beveled sides of the die. The

away from the end faces of the die, and the edges of the side knives are located above or in advance of the cutting edges of the end knives. The ends of the side knives against which the end knives rest are preferably beveled as indicated in the drawing.

The operation will now be briefly described. The die and knives are normally sustained in the inactive or vertically extended relation seen in Fig. 1. In this condition the edges of the working'surface of the convex die member 2 are everywhere above or vertically, spaced from the cutting edges of the knives. Consequently, when the upper part of the press is raised, carrying with it the die member 1, a blank can be inserted between the die members without interference from the knives. Pressure is then applied and the die members compress and shape the blank and unite its layers, the portionof the pressure transmitted through the blank being resisted rigidly or semirigidly. by the springs 14, which do not yield until the stave or article has been completely or sufiiciently formed to permit of the trimmingoperation. The sustaining means then permits the die and knife parts of the appa-' ratus to move relatively to each other in the direction of pressure, thus causing the knife edges to approach the projecting edges of the article.- In this movement the beveled the end knives 8 contact 1 ,semae ceeding in a shearing manner toward the center. As the members 2 and 6 approach each other the beveled and urved faces of sponding end faces of the die member 2, and immediately thereafter the edges of these knives encounter the extremities of the arcs of the projecting ends of the stave, which as the movement proceeds are also trimmed with a shearing cut from both ends toward the center. The trimming of the ends of the stave takes place within the movement required for the trimming ofthe sides, the relations being preferably such that the end cuts are completed sllghtly before the termination of the side cuts, though this may be varied. Thereafter the press may be opened, the formed and trimmed article removed, and a new blank may then be inserted and the operations repeated. .When pressure is removed, the die member 2 and the knife-holder 6 are automaticallyseparated by the springs 12 and the knives are ith the corre-' automatically restored inward by their springs 20 and 20.

What we claim as new is:

1.Apparatus of the character described, comprising a die including concave and convex forming members, a knife-support, yielding trimming-knives laterally movable in said support and having bevel-engagement with the die, and sustainingsprin s between the'die and knife-support.

2. tave-forming and -trimming means,

comprising a die including elongated concave and convex formin members, a knifesupport, laterally-mova le sprin -pressed trimming knives, the knives and is being beveled, and sustaining-springs between the die and knife-support.

3. In apparatus of the character described, the combination of a die including concave and convex forming members, laterally-movable trimming-knives 1n bevel relation to the die, and means for sustaining the die and knives in inactive relation until the material has been formed between the die members.

4.. Apparatus of the character described. comprising, in combination, concave an convex forming die members, a knife-support associated with one of said members, spring-pressed trimming-knives laterally movable in said support, said forming member and knives having cooperative bevel faces, and sustaining means for spacing the forming member and knife-support in inactive relation until the material has been formed between the forming members.

' 5. A device of the character described, comprising the combination of a die including elongated concave and convex forming members, laterally movable side and end in bevel relation thereto, certain of said knives being included between others and having their edges in advance, and means for-temporarily sustaining the die and knives in inactive relation.

7. A device of the character described, comprising a die including elongated concave and convex forming members, laterally movable side and end trimming-knivesin bevel relation to the die, the side knives .being included between the end knives and having their edges in advance, and means for temporarily sustaining the die and knives in inactive relation.

8. A device of the character described, comprising a die including concave and convex forming members, a knife-support associatedwith one of said members, sustaining-springs interposed between said knifesupport and member, and trimming-knives laterally guided in said support, the knives and die having beveled engaging faces.

9. A device of the character described, comprising a die including forming members, a knife-support, guide post connections between said support and one of the forming members, interposed sustaining.

springs, and trimmingknives laterally guided in the knife-support and in bevel re: lation to the die.

10. In apparatus of the character described, the combination of concave and convex" forming die members,- spring-pressed trimming-knives in bevel relation to the convex die member, and means for sustaining said die member and knives in inactive relation while forming pressure is exerted upon the material between the members.

11. In apparatus of the character described, the combination of a die including two forming die members, a knife-support, a knife laterally guided in said support, and means for temporarily sustaining the knife and die in inactive relation, said knife and'die having beveled cooperative surfaces, respectively convex and-concave transversely to their inclination.

12. A stave-forming and -trimming device, comprising a die including elongated concave and convex forming members, laterally movable side and end trimmingknives, means for temporarily sustaining the die and knives in inactive relation, the die and knives having co-acting faces inclined with respect to the direction of pressure and the end knives and faces of the die being in addition transversely incurved.

13. In apparatus of the character described, the combination of a die comprising two forming members and having beveled sides, and laterally movable trimmingknives associated with one of the members, the other die member being of relatively soft material.

14. A device of the character described, comprising a die including concave and convex forming members, transverse ribs provided on said convexed faced member, a knife support, yielding trimming-knives laterally movable in said support and having bevel-engagement with the die and sustaining-springs between the die and knife support.

In witness whereof we have hereunto signed our names at New Yorkcity, in the county of New York and State of New York this 14th day of April, 1919.

HERBERT J. SMITH.

ERNEST P. EVERETT.

Witnesses:

ILLIAM HOLLINGER, 'Vwroa C. CoRMInR. 

